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RussFast LR Roofing Underlay

Name: RussFast LR Roofing Underlay
Brand: Russell Roof Tiles
SKU: irXvV9jLk3aBXXynLBf8Hy

Verified by manufacturer 25 days ago

Russell Roof Tiles

Low resistance vapour roofing underlay

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+44 (0) 1283 517 070 Website

Application

Roofing underlay for warm and cold roof construction.

Description

RussFast LR Roofing Underlay provides a high level of vapour permeability – helping to avoid the risk of harmful condensation, whilst remaining completely airtight.

Features and benefits:

Can be used in all UK locations (zones 1–5).
Excellent nail tear strength.
Fully watertight and airtight.
Helps to alleviate condensation risk in the roof space in accordance with BS 5250.
Easy to cut and lightweight for handling.
No tapes required.

General information

Color	Grey
Material	Plastic
Shape	Rectangle
Length	50000 mm
Width	1000 mm
Warranty description	15 year

Uniclass	Pr_25_57_10_94 Vapour-permeable sheetsPrimary
CAWS	H64/307 Vapour-permeable underlay H64/22 Vapour-permeable underlay H60/235 Vapour-permeable underlay H21/20 Breather membrane H92/785 Breather membrane H67/24 Vapour-permeable underlay H65/22 Vapour permeable underlay H61/22 Vapour-permeable underlay H60/22 Vapour-permeable underlay P10/320 Breather membrane H22/130 Breather membrane H67/290 Vapour-permeable underlay H65/235 Vapour-permeable underlay H62/235 Vapour-permeable underlay H61/235 Vapour-permeable underlay

Specification data - Vapour-permeable sheets

Standard	To BS EN 13859-1.
Third-party certification	Fully independently certified by BM Trada. UKCA marked.
Performance criteria	-
Water vapour properties	≤0.10 MN·s/g. Manufacturer guidance Water vapour resistance.
Tensile properties	MD before artificial ageing: 320 (-20) N/50 mm. MD after artificial ageing: 330 (-20) N/50 mm. CD before artificial ageing: 300 (-30) N/50 mm. CD after artificial ageing: 290 (-20) N/50 mm. Manufacturer guidance Maximum tensile strength.
Class (minimum)	W1. Guidance for specification option: Before and after artificial aging.
Weight (minimum)	184 (-8) g/m². Manufacturer guidance Weight.

Elongation	MD before artificial ageing: 90 (+15)%. MD after artificial ageing: 70 (-25)%. CD before artificial ageing: 90 (+15)%. CD after artificial ageing: 70 (-25)%.
Tear resistance	MD: 190 (-15) N. CD: 200 (-15) N. Manufacturer guidance (Nail shank).
Flexibility at low temperature	-40 °C.

Sustainability data

Country of product manufacture	United Kingdom
Material	Plastic

Literature

RussFast LR Underlay

RussFast LR Roofing Underlay

Application

Description

General information

Color

Material

Shape

Length

Width

Warranty description

Uniclass

CAWS

Specification data - Vapour-permeable sheets

Standard

To BS EN 13859-1.

Third-party certification

Fully independently certified by BM Trada.UKCA marked.

Performance criteria

Water vapour properties

≤0.10 MN·s/g.

Manufacturer guidance

Tensile properties

MD before artificial ageing: 320 (-20) N/50 mm.MD after artificial ageing: 330 (-20) N/50 mm.CD before artificial ageing: 300 (-30) N/50 mm.CD after artificial ageing: 290 (-20) N/50 mm.

Manufacturer guidance

Class (minimum)

W1.

Weight (minimum)

184 (-8) g/m².

Manufacturer guidance

Elongation

Tear resistance

Manufacturer guidance

Flexibility at low temperature

Sustainability data

Country of product manufacture

Material

Literature

Fully independently certified by BM Trada.
UKCA marked.

MD before artificial ageing: 320 (-20) N/50 mm.
MD after artificial ageing: 330 (-20) N/50 mm.
CD before artificial ageing: 300 (-30) N/50 mm.
CD after artificial ageing: 290 (-20) N/50 mm.